This is the Sherwood Ceto Color Enhancing Frameless Scuba Diving Mask

Features:

• Colored Enhanced Single Lens Mask
• Tangine Lens:
  • Offer Optical Contrast While Diving
  • Drastically Reduces Light Wavelength from 400-600 Nanometers
  • Minimizes UV Light Entering Mask
  • Reduces Glare, Improves Optical Clarity
• Rubicon Lens:
  • Adds More Optical Contrast
  • Make Things Easier to Spot While Diving
  • Ideal for Low Light Levels or Night Diving
• Durable Silicone Over-Mold
• Progressively Designed Frameless" Mask
• Lens Closer-to-Face for Enhanced Field of Vision
• Low Internal Volume
• Large Easy-to-Reach One-Hand Nose Pocket for Ear Equalization
• Single Tempered Glass Lens Provides Superior Field of Vision
• Double Feathered Edge High Quality Silicone Rubber Skirt
• Wide Split Style Silicone Rubber Mask Strap
• Feathered Skirt & Wide Strap Design Combined for a Perfect Seal on Face
• Protective Mask Box

The Sherwood Ceto mask is a colored enhanced single lens frameless mask with a durable silicone over-mold. The Tangine lens or orange lens was designed to offer optical contrast while diving. The Tangine lens drastically reduces light wavelength from 400-600 nanometers. This minimizes the UV light entering the mask which reduces glare and improves optical clarity. The Rubicon lens or red lens was designed to add more optical contrast and make things easier to spot while diving. This lens is ideal for low light levels or even night diving. The magenta lens is designed for use in waters where colors are richer and more vibrant. This unique product is designed to filter out blue wavelengths in the water, allowing your eyes to see the brilliant reds, oranges, yellows and green colors that are lost as a diver descends. "